Double wall hydraulic cylinder

A hydraulic cylinder assembly of the type arranged for pivoting cylinder movement to position a trim tab on a boat and comprising:

• a mounting plate including a front surface and a generally flat rear mounting surface having a plurality of holes formed therein for flowing fluid therethrough, such plate further having a pair of lugs integrally formed as one piece with such plate and extending outward from such front surface in a direction generally away from such rear surface, each of such lugs including a generally flat face spaced from that of the other lug;
• a double-acting hydraulic cylinder having a longitudinal axis, a neck for mounting to such plate and first and second expansible chamber for alternately receiving pressurized hydraulic fluid;
• a pair of composite plugs, each such plug extending between and in sealing engagement with a lug and such neck, each such plug including an annular relief and a passage in fluid communication with a passage in such neck and with a hole in such rear mounting surface, each such plug being removable from such assembly without affecting the position of a lug, each such plug being devoid of exterior ports;
• such neck being generally T-shaped and including a body extending along such longitudinal axis and a pair of arms extending laterally outward from such body in a direction generally normal to such axis, each such arm including a generally flat surface in contacting, non-overlapping relationship with a face of a lug;
• the hydraulic cylinder thereby being powered through holes in the rear surface of such mounting plate and being removable from such plate without affecting the position of the mounting plate or either lug.

A hydraulic cylinder assembly of the type arranged for pivoting cylinder movement to position a trim tab on a boat and comprising:

• a mounting plate including a front surface and a generally flat rear mounting surface having a hole formed therein for flowing fluid therethrough, such plate further having a pair of lugs integrally formed as one piece with such plate and extending outward from such front surface in a direction generally away from such rear surface, each of such lugs including a generally flat face space from that of the other lug;
• a double-acting hydraulic cylinder having a longitudinal axis, a neck for mounting to such plate and first and second expansible chambers for alternately receiving pressurized hydraulic fluid;
• a generally cylindrical one-piece composite plug having a pivot axis and extending between and in sealing engagement with each lug and such neck, such plug including a first passage in fluid communication with a passage in such neck and with a hole in such rear mounting surface and further including a second passage in fluid communication with another passage in such neck and with a connection port generally concentric with such pivot axis for receiving an external hydraulic connection, such plug being removable from such assembly for detachment of such cylinder without affecting the position of either lug;
• such neck being generally T-shaped and including a body extending along such longitudinal axis and a pair of arms extending laterally outward from such body in a direction generally normal to such axis, each such arm including a generally flat surface in contacting, non-overlapping relationship with a face of a lug;
• the hydraulic cylinder thereby being powered through such hole in the rear surface of such mounting plate and through such connection port and being removable from such plate without affecting the position of the mounting plate or either lug.